.site-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 12px 18px;
  background: rgba(255,255,255,0.85); /* ελαφρύ φόντο πάνω από το bg */
  backdrop-filter: blur(4px); /* μικρό blur για ημιδιαφάνεια */
  border-bottom: 1px solid rgba(0,0,0,0.08);
}

.site-header .brand {
  font-weight: 700;
  font-size: 20px;
  color: #111;
}

.site-header .nav a {
  color: inherit;
  text-decoration: none;
  margin-left: 14px;
  font-size: 14px;
}

.site-header .nav a:hover,
.site-header .nav a:focus {
  text-decoration: underline;
}